Porcelain shade holder



w. E. TURNER Filed May' 26, 1926 um/"tow attoznug 1 Patented Jan. 4, 1927.

UNITED STATES PATENT OFFICE.

WILLIAM E. TURNER, OF SOLVAY, NEW YORK, AS SIGNOR- TO PASS & SEYMOUR,

OF SOLVAY, NEW YORK, A CORPORATION OF I IEW' YORK.

INQ,

PORCELAIN SHADE HOLDER.

Application filed May as,

This invention relates to shade holders, and more particularly to means for retalning a shade in position in a shade holder.

It is a general object of the present invention to provide a novel and improved shade holder.

More particularly it is an object ofthe invention to provide in a molded shade holder novel means for retaining in position the shade clamping screws.

A further object of the present invention consists in the provision in the flange of a molded shade holder of a non-circular recess in which is loosely positioned a nut, the edges of which engage the walls of the recess to prevent rotation of the same, together with a screw passing through the flange and engaged with the nut, and resilient means for holding the nut against the bottom of the recess.

In the manufacture of molded shade hold em, and particularly those formed of vitreous material, such as porcelain, difliculties have been met in securing therein, in a suitable manner, the shade clamping screws which are usually provided for the purpose of engaging under the bead on the outside of the shade. Fine threads cannot be satisfactorily formed during the molding process and resort has been made to hollow rivets, eyelets and the like, secured in holes in the flange of the shade holder and threaded to receive the screw, but such devices must be provided with some means to preventtheir rotation when the screw is turned. If they are fitted in the hole tightly to prevent this rotation there is danger of cracking the material. The present invention eliminates the above noted and other difficulties.

The single figure of the drawing is a longitudinal section through a shade holder constructed according to the present invention and disclosing a single exemplary embodiment thereof, it being understood, however, that various changes may be made therein without departing from the spirit of the invention or the scope of the appended claims.

Referring to the drawing, there is disclosed at 10 a shade holder formed of vitreous material and shown as provided, in the main body portion, with the internal threads 11 adapted to be screwed directly upon the exterior of the screw shell of a lamp receptacle, although any other suitable means of 1926. Serial No. 111.854.

mountin the shade holder on a fixture may be provided, since they form no part of the present invention. The body portion of the shade holder'is provided with a depending peripheral flange 12 provided with the in ner cylindrical wall 13. The diameter of the cylinder is such as to freely receive therein the bead 14 on the upper end of the shade 15.

A plurality, preferably three, screws 16 are provided, passing through the walls of the flange 12 to clamp under the bead 14 to hold the shade in the shade holder. The screws 16 pass freely through holes 17 in the flange 12. Positioned to surround the inner end of each hole is a channel or groove 18, extending part way through the flange, as best shown at the right hand side of the drawing. The side walls 19 of this channel are substantially radial andv the bottom is preferably substantially parallel to the Wall 13 of the flange, although it may be inclined slightly to give suflicient draft to enable the pattern to be readily removed during the molding process. A nut 20 is provided for each channel and is adapted to lie freely therein and to threadedly engage the screw 16. The sides of the nut engage the walls 19 and hold the nut against rotation. The bottom of the nut abuts the bottom of the channel so that when the screw is threaded into the nut, its inner end is caused to as sume the dotted line position and engage under the head 14, as previously described. In order that the nut may be held at the bottom of the channel to be out of the way when the shade is being insertecha spring 21 surrounds the outer portion of the screw and 1ts ends respectively engage the flange and the under surface of the knurled head 22 of the screw, which is provided for convenience in adjusting the same.

It may sometimes be found desirable to provide a counterbore 23 to receive and ,center the inner end of the spring. Likewise, to center the nut it may be provided with the circular boss 24 adapted to extend partially into the hole 17.

It will thus be seen that the spring will at all times serve to retain the nut against the bottom of the channel. but will not prevent the screw being turned into the. nut to as- Sume the dotted line position to hold the shade in place. The spring performs a second and important function in preventing the from jarring loose and thus allow ing the shade to tall, particularly where the device is used in places subject to considerable vibration. The resilient mounting oi? the nut and screw and the loose fit of all of the parts in the molding material insure that there will be no breakage of this material. At the same time, but little care need be exercised in molding the apertures, for there are no close fits. The channels 18 neednot extend to the lower edge. of the flange, but may be merely shallow recesses, the purpose of the arrangement as shown being to give draft to the pattern. To prevent rotation of the nut it may be of any suitable non-circular configuration to be received in a correspondingly shaped recess.

Having thus described the invention, what is claimed as new and desired to be secured by Letters Patent is:

1. in a shade holder, in combination, a flange adapted to surround the upper end of a shade, the cylindrical inner wall of said flange having a non-circular recess therein, a nut adapted to lie in said recess and prevented from rotation by engagement with the alls thereof, said flange having a hole leading from the recess to the outer surface thereof, a screw passing through said hole and engaged in said nut, a. head on said screw and a spring surrounding said screw and bearing against said outer surface and said screw head.

2. A shade holder, including in combination, a molded flange having a substantially cylindrical inner wall provided with an axially extending channel, a nut adapted to lie in said channel and having edges in engagement with the walls thereof, a hole throu u said flange tronii the bottom of said channel to the outside, a screw passing freely through said hole and engaged in said nut, a head on said screw and a spring surrounding said screw and having its ends espectii'ely engaging said head and flange.

3. ln a vitreous shade holder. in conil iation, a circumferential flange having an internal recess noncirci=.la1. in tor-n1, mid flange having a hole substantially radialn therethrough from the hotton'i ot the recess, a screw passing through the hole, a nut thereon resting in the recess, means to prevent rotation ot said nut and means to re siliently hold said nut in said recess.

In testimony whereof I hereunto attir; my

signature.

lVILLIAM E. TURNER Fil 

